Locking device for demountable tire-rims.



A. DOW.

LOOKING DEVICE FOR DEMOUNTABLE TIRE RIMS.

APPLIUATION FILED JAN. 29, 1909.

922,403 v Patented'May I8, 1909.

UNITED 'STATES PATENT OFFICE. i ALEXANDER Dow,l or NEW YORK, N. Y.,AssIeNoR To Dow RIM COMPANY, A ooRroRA'rioN or- Nnw YORK.

Specicaton of Letters Patent.

Patented May 18, 1909.

' Application filed. January 29, 1909. Serial No. 474,989.

-To all whom it may concern: l

Be it knownV that I, ALEXANDER Dow, a citizen of the United States ofAmerica, residing at New York city, county and State of New York, haveinvented certain new .and useful Improvements in Locking Devices for`Demountable Tire-Rims, of which the following is a specification.

My invention relates to an improved locking device for demountable tirerims', and more particularly for tire rims of the character set forthand described in my co-pend. ing application for United States LettersPatent, Serial No. 470,052, led December 30, 1908. The tire rim of theaforesaid-a pllcation is slipped laterally over the fel y rim and isthen givenl a circumferential movement to brin certain wedges on thetirerim into inter ocking engagement with other wedges on the felly rim.To prevent `displacement of the tire rim or returncircumferentialmovement of the same, there is in my former invention aspring bolt, carried by the felly, which, when the wedges have beenbrought into engagement, registers with and enters a pocket or recess inthe tire rim.

It is the 'object of my present invention to design the spring bolt andcoperating device on the tire rim so that the bolt may engage andsecurely hold the tire rim after the wedges have been moved any desireddistance over each otherinstead of, as above, after the wedges have beenmoved one single predetermined distance over each other. By thusproviding for a variable locking move- Vment of the rims,.no imperfector mlsmated wedges can prevent the locking of the rims, and all Wear onthe wedges can be taken care of.

Having briefly set forth the objects of the invention, an embodiment ofthe same will now be described in detail in connection with theaccompanying drawings, in which:

Figure 1 1s an enlarged detail view in vertical cross-section through asection of the tire rim and wheel felly. -Fig. 2 is a tp plan view ofthesection of the felly in locking deviceshgwn in Fig. 1. Fig. 35 anenlarged detail view in vertical cross-section` through a sectiony ofthe felly/and locking device, shown in Fig. l, with the bolt operat? inglever in another position.' F 4 is a cross-sectional view of the boltcarrying pin, shown in Figs. 1 and 3.

Referring to the drawings, there is shown conveniently vattached to thedemountable tire rim 1, as by rivets 2, a rack or gear section, 3,theteeth 4 of which are da ted to be engaged by the bolt. The wheel felly 5is provided with a rim 6 of the general character shown in my aforesaidprevious invention. In a pocket or counterslnk in the fellyrim is seateda casing 7 secured to the felly by bolts or screws 8. The chamber 9 oftheA casing 7 is preferably rectangular in shape to prevent angularmovement therein of the bolt 10. The bolt 10 is movable vertically inthe chamber 9 on a pin or shaft 11, on to the end of which the bolt isscrewed before placed in position. The shaft 11 extends through thefelly to the inner side thereof, and plvoted at 12 near the end `of theshaft is a finger lever 13. A sleeve or casin 14 attachedV to thefellyand to the casing by the screws 8 embraces the shaft 11.

Seated Within the casing 14 and bearing at one end against a lshoulder15 of the casing, and at the other end against the boltI 10, is a spring1G, which in one position oi7 the finger lever 13 tends to throw thebolt 10 into engagement with the rack 3.

In the surface of the shaft 11 is a rightangle slot 17, which,coperating with a set screw 18, carried by the casing, forms a bayonetjoint. When the bolt 10 is in its uppermost position, as shown in Fig. land in the full lines of Fig. 3, so that the-set screw is at the lowerend of the slot 17, the finger leverj13 and shaft 1l may be turned atright angles to the position shown in Fig. 1.into the position shownin-Fig. 3. When turned into the position shown in full lines in Fig. 3,the finger lever may be turnedaround'its pivot 12 down intothe/'pesitiomshoxvn in dotted lines in Fig. 3. I(The arms 19-of the forkof the finger lever are so desi ed as to provide a cam action when theever is turned up and down. The pivot 12 is nearer the surfaces 20 ofthe arms 19 thanit is to the endsurfaces 21'of these arms. By virtue ofthis construction when .the lever 13 is The bolt on its outer surfacehas a set of vteeth Q3 designed to interlock with-the teeth 4 of therack 3. The rack is of sutill cient length to permit the tire rim to belocked to the felly in a number of positions according to the amount ofmovement that ment with the rack 3 is necessary tov bring the wedges ofthe two rims into proper engagement.

In operation, assuming a tire to be locked on the wheel, as shown inFig. 1, and an vexchange of tires necessary, the finger lever 13 isturned at right angles to the position shown in Fig. 1 into the positionshown in full lines in Fig.'3, the set screw.18 then registering withthe extension Z2 of the slot 17. The linger lever 13 is then turned downinto the position shown in dotted lines in Fig. 3, drawing the teeth 23of the bolt out of engagement with the rack. By -means, such as shown4in my aforesaid application, the tire rim 1 may then be turnedcircumferentially and removed laterally from the felly. A new tire isthen slipped over the felly .and turned circumferentially as far asnecessary to bring the wedges into proper engagement. The finger lever13 is then turned up from the. dotted position of Fig. 3 to the positionshown in full lines of Fig. 3. During this movement of the lever 13, thespring 16 forces the bolt 10 into engageand draws the surfaces 20 of the'lever 13 firmly against'the base of the sleeve 14. The finger lever 13is then turned at rg ht angles from the position shown in ful lines inFig. 3 to the position shown' in Fig. 1, the set screw 18 thenregistering with the extension Q4 of the slot 17.

AIn this position the set screw 18 prevents the finger lever from beingdepressed and the bolt 10 is therefore held securely in enga ement withthe rack 3.

' a demountable Aon the fixed rim and on the demountable rim hereas Ihave described one embodiment of the invention, it is obvious that thestructure could be varied considerably within `the scope of theinvention. 4

Having described my invention what I claim is: 1. The combination of afixed folly rim, rim carrying a tire, wedges adapted to be brought intoen agement with each other by relative circum erential Inovement of theone rim over the other,.means the bolt 10 from the rack' whereby therims may be given relative circumferential movement to' bringthe wedgesinto engagement, and means for locking the rims together in any one of aplurality of relative circumferential positions, the locking position ineach instance being determined by the extent of the relative movement ofthe rims in bringing the wedges into se-A cure engagement, said lockingmeans con! sistingof a rack carried by one of the rims, a toot carriedby the other rim, and meansfor interlocking the' tooth with one of theseveral teeth of the rack.

2. The combination of a fixed felly rim, a demountable rim carrying atire, wed es on the xed rim and adapted to be brought into en agementwith each other by relative circum erential movement of the one rim overthe other, means whereby the rims may be given relative circumferentialmovement to bring the wedges into engagement, and means .tor locking therims together in any one of a plurality of relative circumferentialpositions,-the locking position in each instance being determined by theextent of the relative movement of the rims in bringing, the wedges intosecure engagementLsaid locking means consisting of a device carried bone of the rims on the demountab e rim adapted to enga e with t e otherlrim at.

diiferent points o the latter.

3. The combination of a fixed 'felly rim,

a demountable rim carrying a tire, wed on the fixed rim and on thedemounta 1e rim adapted to be brought into engagement with each other4by relative circumferential. movement of the one rim over the other,means whereby the rims may be given relative circumferential movement tobring the wedges into engagement, and means for lockm the rims togetherin any one of a plurality of relative circumferential posi-- tions, theloekin position in each instance being determine by the extent of therelative movement of the rims in bringin the wedges into secure enagement, said oeking means consisting o a device -carried by one lof therims adapted to be forced into any one of a series of recesses in theother rim adapted to be brought into engagement With each other byrelative circumferential the other,

movement of the one rim over means whereby the rims may be givenrelalive circumferential movement to bring the wedges into engagement,and means for locking the rims together in any one ofa plurality ofrelative `circumferential positions, the locking position in eachinstance being determined by the extent of the rela- *mve movement ofthe lmmsl 1n bung-lng the Slgned by me at. New York mi. County wedgesluto secure engagement, send loeklng end Stae of Bew York, tms 28m anyof means eonslshng of sa, rack on one of the January 190),

xms a bolt on 'the other rim havin" a ALEXNBER GVJ.

toothed edge to'engage such of the teeth of Witnesses: themck as mayhave been made to reglster v.5J"n\l 1m UL .'nnmn theewlth by themovement of the runs. E J. Emvm.

